664512791 has 2 divisors, whose sum is σ = 664512792. Its totient is φ = 664512790.

The previous prime is 664512787. The next prime is 664512799. The reversal of 664512791 is 197215466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664512791 - 2² = 664512787 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664512799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332256395 + 332256396.

It is an arithmetic number, because the mean of its divisors is an integer number (332256396).

Almost surely, 2^664512791 is an apocalyptic number.

664512791 is a deficient number, since it is larger than the sum of its proper divisors (1).

664512791 is an equidigital number, since it uses as much as digits as its factorization.

664512791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 41.

The square root of 664512791 is about 25778.1456082473. The cubic root of 664512791 is about 872.6386578866.

The spelling of 664512791 in words is "six hundred sixty-four million, five hundred twelve thousand, seven hundred ninety-one".